package com.hmdp.service.impl;

import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONUtil;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.hmdp.dto.Result;
import com.hmdp.entity.Shop;
import com.hmdp.entity.ShopType;
import com.hmdp.mapper.ShopTypeMapper;
import com.hmdp.service.IShopTypeService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.List;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class ShopTypeServiceImpl extends ServiceImpl<ShopTypeMapper, ShopType> implements IShopTypeService {
    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result queryByList() {
        String key = CACHE_SHOP_TYPE_KEY ;
        //1.从redis中查询
        String shopTypeJson = stringRedisTemplate.opsForValue().get(key);

        List<ShopType> shopTypes = null;
        //2.判断是否存在
        if (StrUtil.isNotBlank(shopTypeJson)){
            //3.存在，返回信息
            shopTypes = JSONUtil.toList(shopTypeJson, ShopType.class);
            return Result.ok(shopTypes);
        }
        //4.不存在，查询mysql
        shopTypes = list(new LambdaQueryWrapper<ShopType>()
                            .orderByAsc(ShopType::getSort));
        //5.mysql不存在，返回错误
        if (shopTypes == null){
            return Result.fail("店铺类型不存在!");
        }
        //6.mysql存在，转存到redis
        stringRedisTemplate.opsForValue().set(key,JSONUtil.toJsonStr(shopTypes),CACHE_SHOP_TYPE_TTL, TimeUnit.DAYS);
        //7.返回
        return Result.ok(shopTypes);
    }
}
